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ITEM 604.47 - DROP AND PLATE CASTING
A. SCOPE

This work consists of removing existing casting, removing brick and mortar supporting the
casting, plating the hole over the structure, and backfilling the hole. Excavation, plate removal,
and final adjustment to proposed grade will be covered under Items 604.4, Item 604.45, and Item
604.46 as determined by the Engineer.

B. MATERIALS AND CONSTRUCTION

This work shall include all labor, materials, equipment and transportation necessary to drop and
plate the existing manhole castings prior to reclaim and milling as directed. Plates shall be of
sufficient strength for traffic loading. Contractor shall be responsible for keeping records
identifying, with measurements, where all dropped castings are located. Contractor is responsible
for management of all castings once they are removed from the manholes, and for locating all
dropped castings when they need to be adjusted.

Removed castings shall not be stored on private property.

At locations where structures have been lowered, Contractor shall backfill to surface with
compacted gravel or provide a temporary bituminous patch.

The Contractor shall be responsible to maintain the gravel surface or temporary bituminous patch
with particular attention to potential washouts during storm events.

Should compacted gravel not be satisfactorily maintained, the Contractor shall be required to
construct a temporary bituminous patch at all remaining locations where structures are lowered.

Unless otherwise noted herein, this work shall conform to the latest approved City of Nashua
Standard Specifications for Road Construction, City of Nashua Standard Specifications for
Sewers and Drains, and the latest approved NHDOT Standard Specifications for Road and
Bridge Construction. The most stringent specification shall apply unless otherwise directed by
the Engineer.

C. MEASUREMENT AND PAYMENT
Payment for Drop and Plate Casting shall be at the contract unit price specified for each. All
castings regardless of size will be paid for as one (1) each. This payment shall include all

materials, labor, equipment, and all else needed to complete the work under this item.

Contractor shall record the number and location of castings dropped and plated for each street.
Payment is contingent upon submittal of quantities in a per structure, and per street format.

Page 23 of 43

ITEM 608.24 —- 4” CONCRETE SIDEWALK
ITEM 608.36 — 6” REINFORCED CONCRETE SIDEWALK

A.

SCOPE

This work shall consist of constructing four inch (4”) thick sidewalks, five feet (5’-0”)
wide of Portland cement concrete, or six inch (6”) thick curb landings of reinforced
concrete with 6 x 6 — W 2.9 x W 2.9 Steel mesh as shown on the plans or as ordered by
the Engineer. Work includes but is not limited to furnishing, placing, finishing, curing,
stripping, coating and cleanup work associated with the installation of the sidewalk or
walkway. Existing subgrade materials will be evaluated to be reused or will need to be
excavated and replaced with 6” of compacted crushed gravel. The sidewalk shall have a
maximum cross slope of 2%, reinforced (if required) and graded to properly drain. The
curb ramps shall have a maximum cross slope of 2% and maximum running slope of
8.33% but shall not require the ramp length to exceed 15’ if chasing grade. If the road
grade is greater than 2% the ramp or edge of a flush landing may be warped to meet the
street running grade. Curb ramps require a level (2% or less slope in any direction) 5’x5’
reinforced 6” thick landing wherever a turning maneuver is required. All curb ramps shall
be installed with a flush transition to the road surface.

MATERIALS AND CONSTRUCTION

The Contractor shall furnish all materials, labor and equipment necessary for constructing
concrete sidewalk or walkway in accordance with relevant provisions of Section 608 and
Section 520 of the NHDOT Standard Specifications for Road and Bridge Construction,
latest edition. Reinforcement and coating shall be subsidiary. Removal of existing
sidewalk and curbing, earth excavation and crushed gravel subgrade shall be subsidiary.
Transportation and disposal of the removed material shall be the responsibility of the
Contractor. Detectable Warning shall be installed at all curb ramps.

MEASUREMENT AND PAYMENT

Four-inch (4”) concrete sidewalk will be paid for at the contract price per square yard,
complete in place. The area occupied by the curb will not be included in the final pay
quantity. Six-inch (6”) reinforced concrete landings will be paid for at the contract unit
price per square yard, complete in place. Both Items shall include full compensation for
material, equipment and labor to complete this portion of the Bid Schedule. Relocation
of existing small plants and bushes shall be incidental to this item.

Page 24 of 43

ITEM 608.54 - DETECTABLE WARNING DEVICES, CAST IRON

A.

SCOPE

This work shall consist of furnishing and installing a detectable warning surface, concrete
sidewalk pad and tip-down ramp, and accessories at locations shown on the plans, as
specified herein, or as ordered including any and all required surface preparation.

MATERIALS AND CONSTRUCTION

Detectable warnings shall be installed at sidewalk ramps where a sidewalk crosses a
public vehicular way, excluding unsignalized driveway crossings. Detectable warnings
shall measure 24” in the direction of travel and extend the full width of the sidewalk ramp
and the edge nearest the curb line shall be located 6 to 8” from the face of curb line.

Detectable warnings shall consist of a surface of truncated domes and shall comply with
section 705 of the ADA and ABA Guidelines for Buildings and Facilities. Truncated
domes in a detectable warning surface shall have a base diameter of 0.9 inch (23 mm)
minimum and 1.4 inches (36 mm) maximum, a top diameter of 50 percent of the base
diameter minimum to 65 percent of the base diameter maximum, and a height of 0.2 inch
(5.1 mm). Truncated domes shall have a center-to-center spacing of 1.6 inches (41 mm)
minimum and 2.4 inches (61 mm) maximum, and a base-to-base spacing of 0.65 inch (17
mm) minimum, measured between the most adjacent domes on a square grid. Detectable
warning surfaces shall be either natural patina or federal yellow cast iron as directed by
the engineer. The detectable warning shall be placed on a Portland cement concrete
sidewalk pad.

Tap Alamerer of
ce 6o a of the base diameter ', =
. ‘ 0.2
base diameter of a4
ec a i ek ol ———*""..: =)
O94 (23-56 mm) i
(8)
Bleweg icity Iu
fenlargect) plan

Figure 705.1 Size and Spacing of Truncated Domes
MEASUREMENT AND PAYMENT
This item shall be measured by the Square Yard of Detectable Warning Devices installed.
Payment for this item shall be at the contract unit price per Square Yard. This payment

shall also include all materials, labor, equipment, and all else needed to complete the
work under this item.

Page 25 of 43

ITEM 609.01 - GRANITE CURBING
A. SCOPE

This work shall consist of constructing straight or curved granite curb as shown on the plans or
as ordered by the Engineer. Work includes furnishing, placing, and cleanup work associated
with the installation of the curb. Curb shall be installed on a properly graded, compacted bed of
crushed gravel subgrade.

B. MATERIALS AND CONSTRUCTION

The Contractor shall furnish all materials, labor and equipment necessary for setting of granite
curb in accordance with relevant provisions of Section 609 of the NHDOT Standard
Specifications for Road and Bridge Construction, latest edition, and City of Nashua Standard
Specifications for Sidewalk Construction, latest edition. The most stringent specifications shall
apply unless otherwise directed by the Engineer.

Granite curb shall be set with concrete. Concrete shall extend from the top of the binder course
of pavement to below the bottom of the granite curb.

C. MEASUREMENT AND PAYMENT

Granite Curbing will be measured by the linear foot to the nearest 0.1 foot, from end to end along
the lower edge of the exposed face of the curbing and shall include all required excavation and
base course material.

Payment for Granite Curbing shall be at the contract unit price per linear foot, complete in place,

and shall include full compensation for material, labor, equipment, and all else needed to
complete the work under this item.

Page 26 of 43

ITEM 609.5 -RESET GRANITE CURB
A. SCOPE

This work shall consist of removal, stockpiling and resetting granite curb as shown on the
drawings or as directed by the Engineer. Furnishing and placing all materials required for
resetting granite curb shall be included.

B. MATERIALS AND CONSTRUCTION

The Contractor shall furnish all materials, labor and equipment necessary for resetting granite
curb in accordance with relevant provisions of Section 609 of the NHDOT Standard
Specifications for Road and Bridge Construction, latest edition, and City of Nashua Standard
Specifications for Sidewalk Construction, latest edition. The most stringent specifications shall
apply unless otherwise directed by the Engineer.

Granite curb shall be set with concrete. Concrete shall extend from the top of the binder course
of pavement to below the bottom of the granite curb.

C. MEASUREMENT AND PAYMENT

Reset Granite Curb will be measured by the linear foot to the nearest 0.1 foot, from end to end
along the lower edge of the exposed face of the curbing. Payment for this item shall be at the
contract unit price per linear foot, complete in place, and shall include all materials, labor,
equipment, and all else needed to complete the work under this item.

Contractor shall record the location and linear feet of granite curb reset for each street. Payment
is contingent upon submittal of quantities in a per street format.

Page 27 of 43

2 Hazen and Sawyer
1750 Elm Street, Suite 402
Manchester, NH 03101* 603.657.2581

May 16, 2022

Ms. Amy Prouty Gill

Sr. Staff Engineer
Engineering Department
Division of Public Works

9 Riverside Street
Nashua, NH, 03062

Re: Amendment for EPA Municipal Separated Storm Sewer System (MS4) Permit Assistance

Dear Ms. Prouty Gill:

Hazen and Sawyer (Hazen) is pleased to submit an amendment to the MS4 Permit Assistance project. The
enclosed amendment modifies the scope and budget of the original study contract, dated February 18,
2021 (attached as reference). The amendment consists of a second phase of dry weather outfall screening
and sampling as well as supplementing the budget for a second annual report. A detailed budget estimate
for the additional work is enclosed.

Please contact me with any questions at (603) 657-2588.

Very truly yours,

fel

Alberto Angles, Jr., PE

Senior Associate

Enclosure

hazenandsawyer.com

ITEM 609.811 —- BITUMINOUS CURBING

A. SCOPE

This work shall consist of constructing bituminous curbs as shown on the plans or as ordered by
the Engineer. Work includes all furnishing, placing, and cleanup work associated with the
installation of the curbing.

B. MATERIALS AND CONSTRUCTION

The Contractor shall furnish all materials, labor, equipment, and transportation necessary for
constructing bituminous curb as shown on the plans, or as directed by the Engineer. Construction
shall be in accordance with relevant provisions of Section 609 of the NHDOT Standard
Specifications for Road and Bridge Construction, latest edition. Bituminous curb shall be Type
‘B’ (4” Reveal) per NHDOT Standard Details (Plate 1, Standard CR-2). Surface preparation
shall be subsidiary.

C. MEASUREMENT AND PAYMENT

Bituminous Curbing will be measured by the linear foot to the nearest 0.1 foot, from end to end
along the lower edge of the exposed face of the curbing. Payment for constructing bituminous
curb shall be at the contract unit price per linear foot, complete in place, and shall include full
compensation for material, labor, equipment and all else needed to complete the work under this
item.

Contractor shall record the location and linear feet of bituminous curb installed for each street.
Payment is contingent upon submittal of quantities in a per street format.

Page 28 of 43

ITEM 615.03 — TRAFFIC SIGN TYPE C

A.

SCOPE

This work shall consist of furnishing and erecting regulatory and warning traffic signs
and sign supports as shown on the plans or as ordered by the Engineer.

MATERIALS AND CONSTRUCTION

The Contractor shall furnish all materials, labor and equipment necessary for installing
traffic signs, including new posts, foundations, bases and all necessary mounting
hardware in accordance with relevant provisions of Section 615 of the NHDOT Standard
Specifications, latest edition.

MEASUREMENT AND PAYMENT

Traffic Sign Type C will be measured by the square foot. Payment for Traffic Sign Type
C will be at the contract unit price per each square foot, complete in place, and shall
include full compensation for removal of existing signs and posts where being replaced
by new signs, and for material, equipment and labor to complete this portion of the Bid
Schedule.

Page 29 of 43

ITEM 615.033 - REMOVING TRAFFIC SIGN, TYPE C

A.

SCOPE

This work shall consist of removing existing regulatory, warning, and directional traffic
signs and sign supports as shown on the plans or as ordered by the Engineer.

MATERIALS AND CONSTRUCTION

The Contractor shall furnish all materials, labor and equipment necessary for removing
traffic signs, including posts, foundations, bases and all necessary mounting hardware in
accordance with relevant provisions of Section 615 of the NHDOT Standard
Specifications, latest edition.

MEASUREMENT AND PAYMENT

Removing Traffic Sign Type C will be measured by each sign and post removed.
Payment for Traffic Sign Type C will be at the contract unit price per each, complete
removal, and shall include full compensation for material, equipment and labor to
complete this portion of the Bid Schedule. No payment will be made for removal of
signs replaced under other items.

Page 30 of 43

ITEM 615.06 — TRAFFIC SIGN TYPE CC

A.

SCOPE

This work shall consist of furnishing and erecting regulatory and warning traffic signs
shown on the plans or as ordered by the Engineer.

MATERIALS AND CONSTRUCTION

The Contractor shall furnish all materials, labor and equipment necessary for installing
traffic signs, and all necessary mounting hardware in accordance with relevant provisions
of Section 615 of the NHDOT Standard Specifications, latest edition.

MEASUREMENT AND PAYMENT

Traffic Sign Type CC will be measured by the square foot. Payment for Traffic Sign
Type CC will be at the contract unit price per each square foot, complete in place, and
shall include full compensation for removal of existing signs and posts where being
replaced by new signs, and for material, equipment and labor to complete this portion of
the Bid Schedule.

Page 31 of 43